Biorefinery was important means of environmental sustainable development and energy economics change.

生物炼制是环境可持续发展和能源经济转变的重要手段.

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Based on the principle of energy - economics, an equation for calculating the annual total expenses was proposed.

从火用经济学的原理出发, 得到了保温管道整体费用方程及确定最佳管径和保温层厚度的计算公式.

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